linux-kernel - Re: [PATCH v3 2/3] perf: Userspace event

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Date:	Tue, 4 Nov 2014 19:40:31 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Pawel Moll <pawel.moll@....com>
Cc:	Namhyung Kim <namhyung@...nel.org>,
	Richard Cochran <richardcochran@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ingo Molnar <mingo@...hat.com>,
	Paul Mackerras <paulus@...ba.org>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	John Stultz <john.stultz@...aro.org>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Christopher Covington <cov@...eaurora.org>,
	David Ahern <dsahern@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Tomeu Vizoso <tomeu@...euvizoso.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-api@...r.kernel.org" <linux-api@...r.kernel.org>
Subject: Re: [PATCH v3 2/3] perf: Userspace event

On Tue, Nov 04, 2014 at 04:42:11PM +0000, Pawel Moll wrote:
> 
> 1. I'm wrong and the record doesn't have to be padded to make it 8 bytes
> aligned. Then I can drop the additional size field.

No, you're right, we're supposed to stay 8 byte aligned.

> 2. I could impose a limitation on the prctl API that the data size must
> be 8 bytes aligned. Bad idea in my opinion, I'd rather not.

Agreed.

> 3. The additional size (for the data part) field stays. Notice that
> PERF_SAMPLE_RAW has it as well :-)

Right, with binary data there is no other day. With \0 terminated
strings there won't be a problem, but I think we decided we wanted to
allow any binary blow.
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